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arXiv 0709.4639hep-ph
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强子环对$J/ψ$和$ψ^\prime$辐射衰变为$γη_c$或$γη_c^\prime$的贡献

Hadronic loop contributions to $J/ψ$ and $ψ^\prime$ radiative decays into $γη_c$ or $γη_c^\prime$

Gang Li, Qiang Zhao

摘要:

用有效拉格朗日方法研究了中间强子介子环对$J/ψ$,$ψ^\prime \to γη_c$($γη_c^\prime$)的贡献.由于$V\to VP$中独特的反对称张量耦合的性质,强子环跃迁通过耦合形状因子对由朴素的“淬灭”$c\bar{c}$跃迁得到的M1跃迁振幅提供了明确的修正.这一机制干扰了M1跃迁振幅,自然解释了$J/ψ$和$ψ^\prime\to γη_c$中Godfrey-Isgur模型预测的偏差。它还预测了一个小的分支比的$ψ^\prime\to γη_c^\prime$,这可以通过在BES和CLEO-c的实验测量检查。

英文摘要:

Intermediate hadronic meson loop contributions to $J/ψ$, $ψ^\prime \to γη_c$ ($γη_c^\prime$) are studied apart from the dominant M1 transitions in an effective Lagrangian approach. Due to the property of the unique antisymmetric tensor coupling in $V\to VP$, the hadronic loop transitions provide explicit corrections to the M1 transition amplitudes derived from the naive "quenched" $c\bar{c}$ transitions via the coupling form factors. This mechanism interfering with the M1 transition amplitudes naturally accounts for the deviations from the Godfrey-Isgur model predictions in $J/ψ$ and $ψ^\prime\to γη_c$. It also predicts a small branching ratio of $ψ^\prime\to γη_c^\prime$, which can be examined by experimental measurements at BES and CLEO-c.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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